Percy Scawen Wyndham, JP, DL (30 January 1835 – 13 March 1911) was a British Conservative politician, collector and intellectual.

He was one of the original members of The Souls, and built Clouds House at East Knoyle, Wiltshire.

Wyndham married Madeline Caroline Frances Eden Campbell, daughter of Sir Guy Campbell, 1st Baronet, and his wife Pamela FitzGerald, daughter of Lord Edward FitzGerald.

Their third daughter Pamela married firstly Lord Glenconner and was the mother of among others Stephen Tennant, and secondly Sir Edward Grey.

In 1884, he attended a séance with the medium William Eglinton and was impressed by his slate-writing phenomena.